/**
 * @author mazouri
 * @create 2022-01-13 11:56
 */
public class Combine {
    int count = 0;
    public int C(int m,int n) {
        if (m==n-1) return 0;
        if (n == 0) return 1;
        count++;
        return C(m-1,n-1)+C(m-1,n);
    }

    public static void main(String[] args) {
        Combine o = new Combine();
        System.out.println(o.C(20, 15));
        System.out.println(o.count);
    }
}
